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Investigators say they weren't able to determine whether Salaam suffered chronic head trauma from playing football, because his family didn't consent to those tests. Salaam was Muslim and Islam prohibits bodies from being defiled after death.

An autopsy report says he had a history of depression and recent life stressors.

Salaam won the Heisman in 1994 after leading the Buffaloes to a win over Notre Dame in the Fiesta Bowl.